[MIDI] Inflight music sometimes uses the last cue form the previous mission

[Raffaello Grani]

Sometimes it happens that the inflight MIDI iMuse uses the last cue from the previous mission instead of starting with the proper one.

This is especially noticeable when coming from the maze to historical or ToD missions.

https://www.youtube.com/live/QMVjVg8qW1A?si=RAC29g0V9QPyF7OQ&t=418